How to get UIImageView size after autolayout is applied?

Question

My storyboard has UIImageView which is automatically positioned and scaled by autolayout constraints.

When application runs, this UIImageView is properly resized and positioned according to device screen size and autolayout constraints.

How I can get UIImageView frame after it is displayed on the screen? Common UIImageView.bounds and UIImageView.frame values return original values which were used in storyboard and does not reflect new UIImageView size.

Answer 1

In order to get the right frame/bounds of your UIImageView after resizing, you need first ask auto-layout to update that layout using [yourImageView layoutIfNeeded]. that will solve your constraints and update your yourImage.bounds.

[myImageView layoutIfNeeded];
NSLog(@"w: %f, h: %f", myImageView.bounds.size.width, myImageView.bounds.size.height);

Answer 2

Check these methods:

- (void)viewWillAppear:(BOOL)animated {
// view is about to be added to hieararchy
}

- (void)viewDidAppear:(BOOL)animated {
// view was added
}

- (void)viewDidLayoutSubviews {
// VC just laid off its views
}